I'm not sure why it's curious (and anyway you chopped off the "in this" bit, Naomi, which is a reference to what I'll describe for now as just "questionable" business practices particularly with reference to Trump University). But there is no contradiction in a man being on the technically right side of the law and still finding him to be an odious man who shouldn't be let anywhere near the Presidency. After all, those who oppose Clinton are adopting essentially the same position, as she too has been found guilty of nothing without escaping bile and hatred on a level never previously seen (except for Trump).
But anyway, there is no contradiction, or nothing to be curious about. What's relevant isn't the legality but the blatant hypocrisy, and from a man running for high office that matters.